BORRADOR DE LA MODIFICACIÓN DE LA CIRCULAR DE COORDINACIÓN QUE EL FEGA

Figure 5-28 Fiber connection of ROADM station E (networking with ROAM)

SC2

VOA Fix optical attenuator ODF side

Procedure

Step 1 Check the fiber connection of each board according to the fiber connection diagram. The optical fiber of the input port Rx on the OTU needs to be loosely inserted.

Step 2 The line attenuation test is the same as that for the OLA station. See Step 1 in 5.12.3 Commissioning Optical Power of OLA.

Step 3 For the optical power commissioning and insertion loss calculation of the IN and TM ports on the west FIU, see Step 2 and Step 3 in 5.12.3 Commissioning Optical Power of OLA.

Step 4 For optical power commissioning for the SC2, see Step 4 and Step 5 in 5.12.3 Commissioning Optical Power of OLA.

Step 5 For the optical power commissioning and insertion loss calculation of the RM and OUT ports on the east FIU, see Step 6 and Step 7 in 5.12.3 Commissioning Optical Power of OLA.

Step 6 For the optical power commissioning and insertion loss calculation of the IN and TC ports on the west FIU, see Step 8 and Step 9 in 5.12.3 Commissioning Optical Power of OLA.

Step 7 The commissioning method of west-receive OBU1 at the receive end is the same as that of the OLA station. For more information, see Step 12 in 5.12.3 Commissioning Optical Power of OLA.

Step 8 Create the optical cross-connection from the west FIU to the east FIU, from the west FIU to the west OTU. Create the optical cross-connection from east OTU at the transmit end to the east FIU on the U2000.

Step 9 Connect the optical power meter to the fiber of IN ports for the west OTUs individually.

Configure the fixed optical attenuator to ensure that the input optical power of the west OTUs meets the requirements.

NOTE

l If a PIN module is configured as the optical amplifier at the receive end, the OBU and VOA in the dashed frame need to be configured. If the OAU101, OAU103 or OBU103 is configured as the optical amplifier at the receive end, the OBU and VOA in the dashed frame are not required.

l If the OBU101 or OBU104 is configured as the optical amplifier at the receive end and an APD module is configured on the WDM side of the OTU at the receive end, the OBU and VOA in the dashed frame are not required. Instead, a 10 dB fixed optical attenuator needs to be configured.

l There are two types of optical receive modules: PIN and APD. The specific type can be identified through the bar code information pasted on the front panel of the module. The APD also has a corresponding APD warning identifier on the panel of the board.

Step 10 After ensuring that the optical power meets the requirements, tightly insert the fiber into the input port on the WDM side of the OTU.

Step 11 Test the optical power of the IN, DM and EXPO ports for the west ROAM with an optical power meter. Measure the input optical power at the IN port and the single-wavelength output optical power at the Dn port of the D40.

Step 12 Calculate the drop insertion loss from the IN port to the DM port. Calculate the pass-through loss from the IN port to the EXPO port of the west ROAM. Calculate the insertion loss for the D40. The insertion loss for the D40 should be equal to or less than 6.5 dB.

NOTE

l For the ROAM board, Insertion loss = Insertion loss when the inside VOA of the board is zero + Attenuation value of the inside VOA of the board

l When the attenuation of the inside VOA is zero, see the Product Description for information about the insertion loss of the ROAM board.

Step 13 Adjust the optical power of the add wavelengths and pass-through wavelengths for the ROAM.

Method 1 is recommended.

1. Method 1: Select Automatic related to the optical cross-connection mode on the U2000.

The ROAM automatically adjusts the optical power of the add wavelength for east OTU and west pass-through wavelength. This ensures that the average input power of the IN port for the east OBU1 at the transmit end is equal to the typical input power of a single wavelength.

2. Method 2: Select Manual related to the optical cross-connection mode on the U2000.

Manually adjust the attenuation value for each VOA inside the ROAM board. This ensures that the average input power of the IN port for the east OBU1 at the transmit end is equal to the typical input power of a single wavelength.

Step 14 Test the optical power of the EXPI, Mn and OUT ports for the east ROAM by using an optical spectrum analyzer.

Step 15 Calculate the add insertion loss from the Mn port to the OUT port and the pass-through loss from the EXPI port to the OUT port for the east ROAM.

NOTE

l Insertion loss = Insertion loss when the inside VOA of the board is zero + Attenuation value of the inside VOA of the board

l When the attenuation of the inside VOA is zero, see the Product Description for information about the insertion loss of the ROAM board.

Step 16 Test the optical power of the IN port and single wavelength optical power for each output wavelength of the OUT port for east OBU1 by using an optical spectrum analyzer.

Step 17 Calculate the gain of each wavelength for the OBU1. The gain flatness for each wavelength should be less than 2 dB.

Step 18 Query the input and output optical power for the multiplexed signal of the OBU1 by using the U2000. The difference between the values on the U2000 and the test values should be less than 2 dB.

Step 19 For the optical power commissioning of insertion loss calculation for the RC and the OUT ports of the east FIU, sees Step 13 and Step 14 in 5.12.3 Commissioning Optical Power of OLA.

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5.12.8 Commissioning Optical Power of ROADM (WSD9+WSM9)

This section describes how to commission the optical power for a west-to-east signal flow in the ROADM station in the WSD9+WSM9 mode.

Prerequisite

The fiber connection and NE commissioning must be complete.

The optical power commissioning of station D must be complete.

Tools, Equipment, and Materials

Optical spectrum analyzer, optical power meter, signal analyzer, optical fiber, fixed optical attenuator, VOA, U2000